Gaius Cassius Longinus

Gaius Cassius Longinus (85 BC-42 BC) was a senator of the Roman Republic and brother-in-law of Marcus Junius Brutus, with whom he formed the Liberatores faction. They killed Julius Caesar in 44 BC to end his dictatorship, but they were both forced to commit suicide at the Battle of Philippi.

Biography
Gaius Cassius Longinus disliked despots, arguing with the son of dictator Lucius Cornelius Sulla while in school. He took part in the Battle of Carrhae in 53 BC under Marcus Licinius Crassus against the Parthian Empire, but Crassus was killed and the Roman army fell apart. In 49 BC, when the Roman Civil War began, Longinus supported Gnaeus Pompeius Magnus against Julius Caesar and he assassinated Caesar in 44 BC to stop his dictatorship. Longinus and his brother-in-law Marcus Junius Brutus then resisted Caesar's successor Octavian, but they were defeated at the 42 BC Battle of Philippi and Longinus and Brutus committed suicide.